J/ApJ/903/88ivo://CDS.VizieR/J/ApJ/903/88doi:10.26093/cds/vizier.19030088CDSMardini M.K.Placco V.M.Meiron Y.Ishchenko M.Avramov B.,Mazzarini M.Berczik P.Sedda M.A.Beers T.C.Frebel A.Taani A.,Donnari M.Al-Wardat M.A.Zhao G.2022-09-30T23:05:40Z2022-02-17T08:44:45ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frchemically-peculiar-starsvisible-astronomyspectroscopychemical-abundancesThis study presents a comprehensive chemodynamical analysis of LAMOSTJ1109+0754, a bright (V=12.8), extremely metal-poor ([Fe/H]=-3.17) star, with a strong r-process enhancement ([Eu/Fe]=+0.94{+/-}0.12). Our results are based on the 7D measurements supplied by Gaia and the chemical composition derived from a high-resolution (R~110000), high signal-to-noise ratio (S/N~60) optical spectrum obtained by the 2.4m Automated Planet Finder Telescope at Lick Observatory. We obtain chemical abundances of 31 elements (from lithium to thorium). The abundance ratios ([X/Fe]) of the light elements (Z<~30) suggest a massive Population III progenitor in the 13.4-29.5M{sun} mass range. The heavy-element (30<Z<~90) abundance pattern of J1109+075 agrees extremely well with the scaled-solar r-process signature. We have developed a novel approach to trace the kinematic history and orbital evolution of J1109+0754 with a cOsmologically deRIved timE-varyiNg Galactic poTential (the ORIENT) constructed from snapshots of a simulated Milky Way analog taken from the Illustris-TNG simulation. The orbital evolution within this Milky Way-like galaxy, along with the chemical abundance pattern, implies that J1109+0754 likely originated in a low-mass dwarf galaxy located ~60kpc from the center of the Galaxy, which was accreted ~6-7Gyr ago, and that the star now belongs to the outer-halo population.2020ApJ...903...88Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/903/88CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)I/345 : Gaia DR2 (Gaia Collaboration, 2018)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)J/ApJS/61/667 : Kinematics of Galactic old population (Norris 1986)J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)J/ApJ/724/341 : Nucleosynthesis of massive metal-free stars (Heger+, 2010)J/AJ/141/175 : Abundances in M15 RGB/RHB stars (Sobeck+, 2011)J/ApJ/769/57 : Equivalent widths of metal-poor stars (Frebel+, 2013)J/ApJ/797/21 : Carbon-enhanced metal-poor stars (Placco+, 2014)J/AJ/147/136 : Stars of very low metal abundance. VI. (Roederer+, 2014)J/ApJ/819/135 : Lithium-rich giants in globular clusters (Kirby+, 2016)J/ApJ/844/18 : RAVE J203843.2-002333 high-resolution spectro. (Placco+, 2017)J/ApJ/848/L16 : Counterpart of GW170817. I. DECam obs. (Soares-Santos+, 2017)J/ApJ/858/92 : RPA Southern Pilot Search of 107 Stars (Hansen+, 2018)J/AJ/156/179 : Highly r-process-enhanced field * kinematics (Roederer+, 2018)J/ApJ/865/129 : Abundance analysis of HD 222925 (Roederer+, 2018)J/ApJ/868/110 : R-Process Alliance: 1 release in Galactic halo (Sakari+, 2018)J/ApJ/875/89 : Metal-poor stars with APF I. LAMOST CEMP stars (Mardini+, 2019)J/ApJ/882/27 : Metal-poor stars with APF II. MW halo stars (Mardini+, 2019)J/ApJ/874/148 : Metal-poor star RAVEJ093730.5-062655 abundances (Sakari+, 2019)J/ApJ/898/150 : High-res. MIKE obs. of metal-poor stars (Ezzeddine+, 2020)J/ApJS/249/30 : R-Process Alliance: metal-poor star spectro. (Holmbeck+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/903/88https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/903/88http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/903/88https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/903/88https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/903/88http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/903/88GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/903/88/table2Lines, atomic data, EWs, and individual abundancesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonSpeciesphys.atmol.ionStagecharlambda[3874/6708] Wavelength, Angstroms0.1nmem.wldoubleExPot[0/4.44]? Excitation potentialeVphys.atmol.excitationfloatnullableloggf[-9.82/0.58]? Log oscillator strengthphys.atmol.oscStrengthfloatnullablef_EWFlag on EW (1)meta.codecharEW[1.5/107]? Equivalent width, 10^-3^{AA}1e-13mspect.line.eqWidthfloatnullablel_logeps[<] Limit flag on logepsmeta.code.errorcharlogeps[-2.05/6.57] Log number abundance of Ionlog(Sun)meta.id;meta.mainfloat